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Cathodic protection (CP) is an electrochemical corrosion prevention technique, which is implemented by circulating a direct current between an electrode (anode) placed in the environment and the structure to be protected (the cathode): this current causes a lowering of the potential of the metal and reduces its corrosion rate, until it stops.
Potential probes are sensors consisting of a reference electrode and a metal coupon close to the electrode used for measuring the protection potential of underground metal structures in cathodic protection. They allow the reading of the potential purified by the ohmic drop contribution, the so-called IR-free potential, a useful parameter for assessing the effectiveness of a cathodic protection system. Aim of this work is to compare the accuracy of the potential measurements of commercial probes, which differ in geometry, extension of the porous plug, number and position of the metal coupons. Measurements of reference electrode potential stability in the presence of cathodic protection and ability of the probes to compensate the ohmic drop were performed. The results showed that not all potential probes are able to measure the IR-free potential, as the measurement contains an ohmic drop contribution, greater for more negative cathodic polarization values.
Measurement and interpretation of cathodic protection data in plant facilities present challenges where mixed metals are electrically continuous with the protected structure. This paper address some of the confusion and important aspects when using coupons for buried piping in mixed-metal circuits.
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Here we would like to elaborate on corrosion risk associated with coatings that shield cathodic protection.
The State of the Art in the technical/scientific knowledge of the subject of AC corrosion on cathodically protected pipelines. Its mitigation, the studies and the issue of relevant Standards & Recommendations will also be dealt with.